java.net.SocketTimeoutException : null

Question

我正在开发一个 Web 应用程序，它接受来自第三方的 json 数据，处理该数据并使用处理后的 json 数据响应它们。

我在生产服务器上收到 java.net.SocketTimeoutException: null ，但无法在本地计算机上重现。下面是堆栈跟踪:

java.net.SocketTimeoutException: null
at org.apache.tomcat.util.net.NioBlockingSelector.read(NioBlockingSelector.java:191)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:246)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:227)
at org.apache.coyote.http11.InternalNioInputBuffer.readSocket(InternalNioInputBuffer.java:422)
at org.apache.coyote.http11.InternalNioInputBuffer.fill(InternalNioInputBuffer.java:794)
at org.apache.coyote.http11.InternalNioInputBuffer$SocketInputBuffer.doRead(InternalNioInputBuffer.java:819)
at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:124)
at org.apache.coyote.http11.AbstractInputBuffer.doRead(AbstractInputBuffer.java:346)
at org.apache.coyote.Request.doRead(Request.java:422)
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:290)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:449)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:315)
at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:200)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:154)
at java.io.BufferedReader.read1(BufferedReader.java:205)
at java.io.BufferedReader.read(BufferedReader.java:279)
at java.io.Reader.read(Reader.java:140)

引发此异常的代码段(特别是“while”条件):

public static String getPostData(HttpServletRequest request) throws 
IOException {
    StringBuilder stringBuilder = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
        InputStream inputStream = request.getInputStream();
        if (inputStream != null) {
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } else {
            stringBuilder.append("");
        }
    } finally {
        if (bufferedReader != null) {
            bufferedReader.close();
        }
    }
    return stringBuilder.toString();
}

此应用程序部署在具有相同服务器配置的 3 个不同的 AWS 区域中，令人惊讶的是只有其中一个区域抛出此异常，而且也仅针对极少数随机请求。

感谢任何帮助。提前致谢!

Answer 1

为了重现套接字超时异常，您必须让客户端开始下载，然后暂停下载一段时间。您可以通过以下方式实现此目的

• 安装可以模拟不同网络情况(带宽、延迟等)的操作系统工具
• 编写您自己的测试客户端(请参阅 https://examples.javacodegeeks.com/core-java/net/sockettimeoutexception/java-net-sockettimeoutexception-how-to-solve-sockettimeoutexception/ )